Crank-shaft twister.



L. H. MILLER & E. L. JACKSON. CRANK SHAFT TWISTER. lpgggpgfygn APPLLCATION man own. 1912 Patented Oct. 22 1918 a SHEETSSHEET x.

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L. H. MILLER & E. L. JACKSON. CRANK SHAFT TWISTER.

lygggpg zzo APPLICATION FILED 0cT.24. i9l7. Patented Oct. 22 1918;

3 SHEETS-SHEET 2.

L. H. MILLER & E. L. JACKSON CRANK SHAFT TWISTEB. lygvggg iza APPLICATION FILED 0CT.Z4,19H. Patented Oct. 22,1918k 3 SHEETS-SHEET 3.

lying in the same plane,

- convenientl KISSED MICHIGAN.

CRANK-SHAFT TWESTEEt.

To all "whom it may concern:

Be it known that we, LEON H. MILLER and ELMER L. JACKSON, citizens of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Crank-Shaft Twisters, of which the following is a specification, reference being had therein to the accompanying drawings. I

In the operation of bringing multi-throw crank shafts to final position and form, it is the custom to stamp or forge a blank having the desired crank arms. and crank pins, all and then to twist the various crank ins and arms into desired angular relation. lhis may be done in a press. Hitherto, so far as applicants, each size of crank a corresponding die or known to t e shaft has required twisting machine.

This invention relates to means whereby crank shafts may be brought into final form by twisting, as in apress,

to be quickly andeasily set for any crank shaft of any dimension within the range of the device, and whereby the necessity of a multitude of extremely costly fixtures for the work, is obviated. 1

The invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claims.

in the drawings, A

Figure 1 is a plan View of a twisting die or bed that embodies features of the invention. arranged to receive a six throw, three bearing crank shaft;

Fig. 2 is a view in longitudinal section theret rough showing a crank blank applied in readiness for twisting;

Fig. 3 is a view in longitudinal section and partially in elevation, of a head coiiperatin%with such die bed for twisting the crank;

in. 4 is a view in section taken on or about line lV-IV of Fi 2, showing the bed with the crank sha t applied before twisting; p

Fig. 5 is a section showin head at the bottom of its stro e blank twisted intofinal position;

Fig. 6 is a view in section taken on or about line Vii-VI of Fig. 2;

Fig. 7? is a view in section taken on or about line Wli-VII of Fig. 3

. Fig. 8 is a view in detail and in end eleva the presser Specification of Letters Patent;

Application filed flctober as, 1917.

the means being 7 arranged with interchangeable parts so as locating blocks with crank Patented @(Bt. 532, 913. s mi no. raaaac.

tion showing one form of clamping means for securing the blank in position; and

F 1g. 9 1s a view in longitudinal section,

reduced in size showing the application of the device or set-up for a seven bearing six throw crank shaft.

As herein shown in preferred form, a die bed 1 of suitable material and design to provide requisite strength, is arranged with end walls'2 and side walls 3 that act to retain a series of locating block'sinterspersed and held in spaced relation by filler blocks.

A pair at least of the locating blocks, as

indicated at a, are arranged as clamping or journal members each having a swingin pivoted arm 5, the slotted end portion ct which is locked when closed by a suitable pin 6 and cross key/Z. Suitable bushings 8, alf segments in contour, are suitably and detachably arranged in each clamping member 42. Intermediate journal blocks 9 each have segmental bushings 10 that are in axial a'linement with-the bushings 8 of the clamping members when inserted in the die. (If course any-means forlocating the bushings 8 and 10 detachably, as for example dowel pins 11, keys or other means, may be employed. g

@thers cfthe same series of blocks are disposed as'locating blocks in right and left hand relation to the central axis of the journal blocks to provide stops for arresting and locating the crank pins which are turned into angularrelation with those crank pins which lie in a verticalplane, as the blank is first inserted. Forex'ample, certain of the indicated at 12, havebushings 13 disposed on one side of the axis of the bushings 8 and 10, while others indicated at 14, have bushings 15 appropriately disosed onthe other side ofthe axis of the ushings.

When assembled indesired location and position, the parts are clamped longitudi nally by set screws 37 provided with jam nuts 16 and inserted in one of the end walls of themain bed. Movement is prevented by keys 1?, T the end faces 18 of each of the blocks being slightly inclined in relation to the face 19 of the confronting side wall 3.

. The die bed 1. is arranged to be secured on the bed of a press. A header or-presser plate 18, of suitable design and proportion, is arranged to be secured to the head or punch of the press for which the bed 1 is de signed. This head has a longitudinally di posed and removable bearing shaft or pin 19, on which are hung twisting arms corresponding in number and longitudinal location to the blocks 14. When in initial position, bushings 21 on each of these twisting arms are in the vertical plane of the bushings 15 so as to encounter the crank pins 22 of a crank blank inserted vertically as indicated in Fig. 2. Adjustment for accurate initial positioning of these twisting arms'is obtained, by means of a suitable screw 23 in each arm bearing against a stop lug 42 of the head 18. Another longitudinally disposed bearing pin 24 carries another set of twisting arms 25 with their appropriately disposed bushings to correspond to the blocks 12 of the bed. I

A centrally disposed presser arm 26 is non-pivotally secured to the block or header 18 over and in alinement with the bushing 10 of each bearing block 9. Local adjustment of the arm 26 is secured by studs 27 entering a T slot 28 of larger proportions than the bolt or stud, to permit setting of the bushing 29 carried by the arm 26 in accurate alinement with the companion bushing 10 of the bed.

To avoid shock on the pins 19 and 24, the inner end portions 30 of the arms 20 and the corresponding end portions 31 of the arms 25 are formed to bear directly against corresponding bearing surfaces 33 and 34 of the header plate 18. f

The end journal termediate journal 'blocks 9, and locating blocks 12 and 14 are held in proper spaced relation by filler blocks 35 of the desired and necessary longitudinal dimensions. These latter are secured by keys 36 similar to the keys 17.

It is to be understood that the angular relation of the crank arms 20 and 25 to the presser head 18 is such that when the bushings 21 and corresponding bushings of the parts 25, encounter the upwardly positioned corresponding crank pin portions of an inserted crank shaft blank, the resultant of' the downward movement of the presser head 18 is to swing the crank pins into the mating bushings 13,0r 15 as the case may be, of the bed, andthereby bring the parts to accurate angular relation andposition.

To insure that the other crank pins of the blank are accurately positioned, elongated presser arms 38 with bushings 39, cooperate with bushings 40 on appropriately sized blocks 41 to set the blank and prevent distortion by spring of these parts when the rest of the blank is being twisted into place. Of course by the use of appropriate spacmg blocks andof the desired intermediate bushing blocks, any crank shaft can in one operation be twisted into final form by a device of this sort, the bushings of the several blocks and arms being easily replaced by or clamping blocks 4, ini bed,

others of a radius corresponding to that of the crank pins on which they set. An illustration of this is shown in Fig. 9 wherein the device is shown aS arranged for a six. throw seven bearing crank shaft.

As a result of this arrangement of parts, a crank shaft twister is obtained that is readily adjustable to any crank shaft so that by substitution of'the interchangeable parts.

the whole may be set up quickly and readily, and the necessity'of a costly permanent die for'each size of crank shaft and of a corresponding header is obviated.

Obviously, changes in the details of construction may be made without departing from the spirit of our invention and we do not care to limit ourselves to any particular form or arrangement of parts.

What we claim is 1. A crank shaft twister comprisin a bed, apresser head reciprocable over the ed, means for receiving and detachably securing the journal portions of a crank shaft blank on the bed, means for detachably securing part locating blocks in the bed for locatin crank pin portions of an inserted cran shaft, and means pivotally secured in the head each in the vertical plane of a companion locating block adapted to force the corresponding crank shaft blank portions to seat on the respective locating blocks when the presser head is moved toward the bed.

2. A crank shaft twister comprising a bed, a presser head reciprocable thereover, journal blocks detachabl secured in the bed, crank pin locating locks detachably secured in the bed, bushings detachably secured in the several blocks, and oscillatory means detachably secured in the head each in the vertical plane of a companion locating block bearing bushing, adapted to force the corresponding crank shaft blank ortions to seat in the respective locating b ocks when the presser head is forced toward the bed.

3. A crank shaft twister comprising a bed, a presser head reciprocable to and from the face of the bed, a series of crank shaft journal blocks detachably and adjustably secured in the bed, a series of crank pin locating blocks detachably secured in the bed in spaced and adjustable relation to the j ournal blocks, clamping means secured in the bed detachably holding the end bearing portions of an inserted crank shaft blank in the bed, and oscillatory means pivotall secured companion locating block adapted to force the corresponding crank shaft blank portions to seat on their respective companion blocks when the presser head is forced toward the bed.

4. A crank shaft twister comprising a a set of journal blocks adjustably and detachably secured in the bed, holding clamps for securing the journals of an inserted crank shaft'blank on certain of these locks, a set of crank in locating blocks detachably and adjustahly secured in the bed, a presser head and oscillatory members disposed in sets on pivots in the head adapted to encounter and swing crank pin portions of the blank inserted in the bed on to the locating blocks that are companion each to a swinging member when the presser head is moved toward the bed 5. A crank shaft twister comprising a bed, a set of journal blocks adjustably and detachably secured in the bed, holding clamps for securing the journals of an inserted crank shaft blank on certain of these block, a set of crank pin locating blocks detachably and adjusta'bly secured in the bed, a. presser head and oscillatory members disposed in sets on pivots in the head adapted 'to encounter and swing crank pin portions of the blank inserted in the bed on to the 10- cating blocks that are companion each to a swinging member, and means for adjustably regulating the position of the depending arms.

In testimony whereof we aifix our signatures in presence of two witnesses.

LEON H. MILLER. ELMER L. JACKSON. Witnesses:

ANNA M. Donn, CHAS. W. Srenmenn. 

